docs: def install_alternative(name, target, source, priority=50):
      ''' Install alternative configuration '''
      if (os.path.exists(target) and not os.path.islink(target)):
          # Move existing file/directory away before installing
          shutil.move(target, '{}.bak'.format(target))
      cmd = [
          'update-alternatives', '--force', '--install',
          target, name, source, str(priority)
      ]
      subprocess.check_call(cmd)